/* 基础样式与全局设置 */
body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, #121212, #1a1a1a);
    color: #ffffff;
    line-height: 1.6;
    padding: 20px;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    color: #ff7e00;
    font-weight: bold;
    margin-top: 30px;
    margin-bottom: 15px;
}

p, ul, ol {
    font-size: 16px;
    margin-bottom: 20px;
}

ul, ol {
    padding-left: 20px;
}

code {
    background-color: #2d2d2d;
    color: #ff7e00;
    padding: 2px 5px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
}

pre {
    background-color: #2d2d2d;
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 20px;
}

/* 模块化布局与网格系统 */
.container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.card {
    background: linear-gradient(135deg, #2d2d2d, #3a3a3a);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease-in-out;
}

.card:hover {
    transform: translateY(-5px);
}

/* 动画效果 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.section {
    animation: fadeIn 1s ease-in-out;
    opacity: 0;
    animation-fill-mode: forwards;
}

/* 导航栏与进度条 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(90deg, #121212, #1a1a1a);
    z-index: 1000;
    padding: 10px 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.progress-bar {
    height: 5px;
    background: linear-gradient(90deg, #ff7e00, #ffaa00);
    width: 0%;
    transition: width 0.3s ease-in-out;
}

/* 图片样式 */
img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin-bottom: 20px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }

    h1 {
        font-size: 24px;
    }

    h2, h3 {
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    .card {
        padding: 15px;
    }
}